Adhesive surface and method of preparing same.



C. E. SCHUDER.

ADHESIVE SURFACE AND METHOD 0F PREPARING SAME. APPLICATION FILED DEC.2. 1918.

1,297,406. Patented Mau'. 1S, 1919;',

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ADHESIVE sUrAon AND METHOD or PREPARING SAME.

menace. i

Specification of Letters Patent.

Patenten Mar. is, raie.

Application filed December 2, 1918. Serial No. 264,915.

T0 all whom t may concern:

Be it known that I, CHARLES E. SoHoDER, a citizen of the United States, and a resident of New York, Bronx borough, in the county specification.

This invention relates to adhesive surfaces and to the method of preparing the same.

The object of my improvements is to provide an adhesive surface for sheet materials which will not cause the material to curl or buckle and which will adhere equally well to such other surfaces or portions thereof, which are more or less covered with printers ink.

My improvements comprise features which are illustrated diagrammatically in the drawings accompanying this specification, wherein:

Figure 1 represents a cross-section of a sheet of material treated according to my improvements. Fig. 2 is a similar cross-section to that of Fig. l but having a film of ink next the sheet. Fig. 3 is another cross-'section similar to Fig. 1, showing my improvements applied to portions of the sheet only. The scale is the same in all the figures of the drawing but is' much exaggerated over actual size. y

Heretofore it has been common practice to provide a gummed surface for paper, cloth or other flexible sheet material by coating lwith liquid gum arabicor other gum sol-` uble in water, and then drying the gummed surface. When desired for use for attaching by its gummed surface to any object, the gummed surface is moistened with water to soften the gum and the sheet material is then applied with its moistened, gummed face against the surface to which it is desired to secure it.

Among vthe objections to this well known procedure is the fact that ums dissolved in water and applied in solution to the surface of paper, for instance, are prone to cause the paper to curl and buckle in drying, making it difficult and sometimes impossible to stack the gummed sheets in orderly fashion. Such stacking is particularly necessary if those sheets bear printed matter which is to be diecut into regular or irregular shaped labels, and which cutting is commonly done in piles of a hundred or more at a time.

The distortion of the pile of sheets due to curling because of the gum thereon, results in misregister with the die and many of the labels are injured or ruined.

In some cases strips of gum are applied to portions only of such sheets and then those gummed portions bulge, and it is very diiicult to bring a pile of such sheets into a compact and flat mass for cutting. Tn other cases it is desirable to apply the gum to the printed surface of sheets of paper and the gum, after drying, tends to flake off the inked surface. This is particularly the case after moistening the gummed, inked surface and applying it to a surface to which it is desired to attach the sheet. The sheet is very easily stripped from the surface to which it is applied, and very often a dry atmosphere will cause it to curl and peel off .without eX- traneous assistance.

By my improvements these several features of objection are obviated.

Referring to the drawing, in Fig. 1 the sheet of material 2, such as paper, has on one surface thereof a coating 4, preferably of anhydrous sizing and preferably nonsoluble in water, such as a quick-drying varnish. This may be .applied by some convenient means, which, particularly in case it is desired to apply said sizing to selected portions only, is preferably that of printing in an ordinary printing press, either from a roll or flat form. While said sizing is still tacky, powdered adhesive 5, preferably soluble in water, such for instance vas powdered dextrin, is dusted onto the sized surface. A portion thereof will adhere to the sticky, sized surface and the surplus may be brushed off.

The completed product will dry promptly and, through the use of said anhydrous sizing and dry powdered um, will not cause the paper to curl orbuc le in drying.

In some cases it is desirable to provide a printed surface `with an efficient adhesive, and in Fig. 2 the material 2 is shown having a coating of ink 3 printed thereon and the sizing 4 applied to the 'surface of said ink. Said sizing will adhere to the surf-ace o-f the ink just as securely as to the surface of the material, and said sized surface of fthe ink may then receive the powdered adhesive, asl just described in reference to Fig. 1. In Fig. 3 the sizing 4. is shown in isolated patches or strips on the material 2, and the powdered adhesive 'when dusted on, will 110 adhere only to those patches or strips. In this ease, no more than when spread over a larger surface, will the sizing and adhesive cause the sheet 2 to cu-rl or bukle.

My improvements are particularly adapted for supplying adhesive portions to cutout printed advertising pictures, such as are attached to the inside surfaces of glazed windows to 'be observed from the outside. Inv this case it has been found convenient to apply my improved adhesive in a strip adjacent the border of the picture, and when soapplied thepictures lie flat without edge curling, so common with the usual gummed edges.

An important advantage furnished by my improvements is that, when the adhesive is damped for application to any surface, the presence between the sheet and .the adhesive of the sizing, prevents the dampness penetra-ting the paper, thus conserving the strength of the paper, and also ai'ording no opportunity for the paper to curl from dampness.

Other uses for my improved adhesive will be obvious to those familiar with the general art.

1. The combination on a sheet of material of an anhydrous sizing, and a coating of powdered adhesive, soluble in water, on said sizing.

2. That improvement in the art of pro- I viding a sheet of material with an adhesive surface, comprised in applying to the surface of the material a sizing, non-soluble in water, and dusting onto said sizing before drying, a powdered adhesive, soluble in water.

4. That improvement in the art of providing a sheet of material with an adhesive surface, comprised in applying to the surface of the material a quick drying varnish, and dusting onto said varnish, before drying, a powdered adhesive.

5. That improvement in the art of providing an inked surface of a sheet of material With an adhesive, comprised in printing onto Ithe inked surface a quick drying varnish, and dusting onto said varnish, before drying, a powdered adhesive.

In witness whereof, I hereby affix my signature this 29th day of November, 1918.

CHARLES E. SCHODER. 

